Process oe painting



Patented Oct. 27, 1925.

UNITED STATES PATENT OFFICE.

PROCESS OF PAINTING.

Ne Drawing. Application filed May 5,

To all whom it may concern:

Be it known that I, THOMAS E. THOMP- soN, a citizen of the United States, residing at l/Vilmette, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Processes of Painting, of which the following is a specification.

The present invention relates to paint.

Difficulty has been encountered in the use of paints which are subjected to heat by a baking or japanning process in that said paint is likely to become discolored. For instance, if red paint or blue paint or paint of any other color is subjected to a baking or japanning process, said colors are likely to become blackened during or after the process of subjecting them to the elevated temperature, particularly if the temperature runs up as high as 500 or 600 degrees Fahrenheit. It is very desirable in a number of cases, as, for example, in automobile painting, to bake said paint upon the automobile parts; but the fact that discoloring is liable to occur has had a limiting effect upon the range of colors which may be utilized. In fact, the only color which will remain fast throughout and after the baking or japanning process is black.

An object of the present invention is to provide a process of applying a coating of permanent color. A further object is to provide a process of applying to an article a coating of permanent color which is well adapted to withstand hard usage and exposure.

Further objects will appear as the description proceeds.

According to the present invention, a colored enamel is provided, which enamel is preferably produced by fusing at relatively high temperatures, that is, at temperatures ubOXG those at which the ordinary baking or japanning process takes place. It will be understood that the term enamel as here used is intended to cover all such fused substances as, for example, colored glass, ir-

1924. Serial No. 711,046.

respective of whether or not the substance is what is ordinarily known in the trade as enamel. This enamel, which may be of any desired color, is ground to a relatively fine powder and mixed with a fluid vehicle, and is not intended or adapted to be again fused after application to the surface to be covered. Said vehicle may be oil, (for example, linseed oil), such as is used for ordinary painting, or may be varnish, such as used in connection with japanning. Said vehicle should be of a nature such that it leaves a binding residue upon evaporation.

The color of the powdered enamel is absolutely permanent, and when the mixture of said powdered enamel with oil or varnish is subjected to baking temperatures below the fusing point of the enamel, said color is not affected. For this reason discoloration in the baking process is absolutely avoided.

Though the matter of painting or japanning has been referred to specifically in the description appearing above, it is to be understood that the invention in its broader aspects includes materials which are used not only as covering materials but also for plaster and the like, which has the pigment distributed throughout a material thick ness of carrying vehicle. The present invention is subject to various modifications. It is intended to cover all such modifications that fall within the scope of the appended claim.

NVhat is claimed is:

The process of covering an article with a coating of permanent color which consists of applying to said article a mixture of powdered fused enamel of predetermined color and a fluid vehicle which leaves a binding residue, and baking said article at a temperature below the fusing point of said enamel.

Signed at Vilmette, Illinois, this 1st day of May, 1924.

THOMAS E. THOMPSON. 

